Polishing-brush.



No. 863,790. PATENTED AUG. 20, 1907.

I W. DIXON.

POLlSHIlTG: BRUSH.

APPLIOATION'IILED DEO.16,1906.

UNITED STATES WILLIAM DIXON, OF NEWARK, NEW

JERSEY.

POLISHING-B RUSH.

Application filed December 15, 1905- To all-whom it may concern:

Be it known that I, WILLIAM DIXON, a citizen of the United States,residing in Newark, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Polishing-Brushes, ofwhich the following is a specification.

This invention relates to polishing brushes of the rotary type and hasfor its object to provide a construction in which the bristles are heldin a very secure and permanent manner.

With this end in view, the invention consists in a polishing brush whichembodies the novel features and combinations of parts to be hereinafterdescribed-and finally pointed out in the claims.

In the accompanying drawings, in which the same reference charactersdenote the same parts throughout the several views, Figure 1 is aside-elevation of a polishing brush constructed in accordance with theinvention, Fig. 2 is an enlarged transverse section on line 2, 2, Fig.1, Fig. 3 is a side-elevation of one of the side-plates, Fig. f is atransverse section on line 4, 4, Fig. 3, Fig. 5 is a side-elevation ofone of the plates constituting the core about which the bristles aredoubled, Fig. 6 section on line (3, 6, Fig. 5, Fig. 7 is a transversesection through the core showing the plates constituting said core intheir normal position, and Fig. 8 is a perspective view of the thimbleupon which the brush is mounted, the upset end of said thimble beingindicated by dotted lines. 7

In the drawings a, a denote the dish-shaped sideplates of the improvedpolishing brush. These plates are preferably made of sheet-steel, andeach is provided with a central opening a through which passes asleeveshaped thimble b. The plates a are provided at theircircumferences with sharp inwardly-extending edges (1 which serve tobite into the circular body (Z of bristles, said body being formed bydoubling a number of bris tles about an annular core which is locatedbetween the two side-plates. This core is formed of two annular plates 0having slightly bent-up inner rims as shown in Figs. 6 and '7. Saidplates are made of spring-metal and their outer portions, when saidplates are in normal position, being placed face to face, as shown inFig. 7, diverge outwardly, as shown. However, when the bristles d aredoubled about the core constituted by said plates and the dishedside-plates a are pressed towards each other, the diverging outerportions of the annular plates 0 are pressed into parallelism, as shownin Fig. 2, in which position they exert a spring action laterally inopposite directions, that is to say, in the direction of the side-platesa, and thereby firmly clamp the bristles Specification of LettersPatent.

is a.

Patented Aug. 20, 1907. Serial No. 291,895-

against the inner faces of the latter. The dished plates a are heldfirmly together, in the position shown in Fig. 2, by the thimble b whichpasses through the central openings of said plates, as heretoforeexplained. Said thimble is passed through said openings when in the formshown in Fig. 8, after which it is bent up at its plain end to form acircumferential rib or shoulder b as shown in full lines in Fig. 2 andin dotted lines in Fig.8, so as to firmly unite the parts into a unitarystructure.

By the pressure exerted by the spring core upon the bristles, wherebythe latter are firmly clamped between the side-plates and said core, andby the biting of the sharp circumferential edges of the side-plates intothe bristles, a construction is obtained by which the loosening andfalling out of-the bristles is practically obviated. Furthermore, bythis construction the bristles are so held that instead of having atendency to project laterally and become enlarged at the circumferenceof the brush, they are made to converge slightly and intersect at theirouter ends, so that the width of the brush at the circumference isapproximately equal to or even less than the thickness of the body ofthe bristles at the point where the bristles leave the outer edge of thesideplates. This imparts to the brush great stiffness and resistance tothe work during the polishing action and renders the brush very durableand eflicient in use.

The parts of the improved polishing brush may be assembled very readilyby suitable machinery, so that brushes constructed in accordance withthe invention may be turned out in large quantities and at acomparatively low price. After the assemblage of the parts and theupsetting of the plain end of the thimble, the un even outer ends of thebristles are trimmed, after which the brush is ready for use.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. In a rotary polishing brush, the combination of an annular corehaving normally separated spring-portions, bristles doubled about saidcore, and side-plates inclosingsaid bristles and exerting pressure onsaid core, whereby said spring-portions thereof are pressed toward eachother.

2. In a rotary polishing brush, in combination, a core comprisingannular spring-plates placed face to face and normally having theirouter portions diverging in outward direction, bristles doubled aboutsaid core, side-plates confining said bristles and exerting pressure onsaid core whereby said outer portions thereof are maintained inparallelism, and a thimble upon which said side-plates are secured.

A polishing brush comprising a central core formed of annular plateshaving inwardly diverging inner rims, a bruslrbody composed of bristlesdoubled about said core, dished side-plates having central openings, anda thimble passing through said openings in said dished plates andprovided with upset ends for retaining said plates thereon.

4. A polishing brush comprising an annular core composed of twospring-plates having inwardly diverging rimportions, a brush-body formedof bristles doubled about said core and radiating therefrom, dishedside-plates provided at their circumferences with inwardly-disposededges biting into said bristles, and a thimble upon which saidside-plates are secured.

5. A polishing brush comprising a thimble, side p1ates mounted thereon,and an annular core of springmetal about which said bristles aredoubled, said core having diverging flanges compressed between saidbristles.

In testimony, that I claim the foregoing as my inventien, I have signedmy nzune in presence of two subscribing witnesses.

' WILLIAM DIXON.

Witnesses:

I'IENRY J. SUHnBInn, JACOB ROTH.

